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Impact of Delayed Acknowledgment on TCP performance over LEO satellite constellations

Tauran, Bastien and Lochin, Emmanuel and Lacan, Jérôme and Arnal, Fabrice and Gineste, Mathieu and Kuhn, Nicolas Impact of Delayed Acknowledgment on TCP performance over LEO satellite constellations. (2017) In: Fifth Federated and Fractionated Satellite Systems Workshop, 2 November 2017 - 3 November 2017 (Toulouse, France). (Unpublished)

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Abstract

This paper aims at quantifying the impact of a default TCP option, known as Delayed Acknowledgment (DelAck), in the context of LEO satellite constellations. Satellite transmissions can suffer from high channel impairments, especially on the link between a satellite and a ground gateway. To cope with these errors, physical and link layer reliability schemes have been introduced, at the price of an increase of the end-to-end delay seen by the transport layer (e.g. TCP). Although DelAck is used to decrease the feedback path load and for overall system performance, the use of this option conjointly with satellite link layer recovery schemes might increase the delay and might be counterproductive. To assess the impact of this option, we drive simulation measurements with two well-deployed TCP variants. The results show that the performance gain depends on the variant used and that this option should be carefully set or disabled as a function of the network characteristics. DelAck has a negative impact on TCP variants which are more aggressive such as TCP Hybla, and should be disabled for these versions. However, it shows benefits for TCP variants less aggressive such as NewReno.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Thales (FRANCE)
Laboratory name:
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Deposited By: Bastien TAURAN
Deposited On:18 Oct 2017 09:20

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